How to Use Safari's Top Sites Page
The Top Sites page in Safari, the browser that comes with Mac OS X Mountain Lion, displays a selection of sites you visit frequently and will quickly become one or your favorite Safari features.
To see it, choose History→Show Top Sites, press Command+Option+1, or click the Top Sites button, which you’ll find to the right of the Show All Bookmarks button.
As you surf the web, Safari learns your favorite sites and replaces the sites on the Top Sites page with the ones you visit most.
The little stars you see in the top-right corner of some sites indicate that the page has changed since the last time you visited it (a very nice touch).
Click the Edit button in the bottom-left corner, and you can
Delete a site you don’t want on your Top Sites page. Click the little X in its top-left corner.
Pin a site to your Top Sites page to make it remain one of your Top Sites, even if you don’t visit that page for a while. Click the pushpin in its top-left corner. All the items in the top row are marked as permanent Top Sites.
Change the number and size of the sites shown. Choose Small (24 sites), Medium (12 sites), or Large (6 sites).